variable cycle engine

conventional engine

lol so, safran guys need 18 months time to upgrade m88 core and not to fix the Kaveri issue so why we are wasting our 1 billion offsets in Kaveri, french guys are simply using 1 billion dollar in upgrading their core engine

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It's the least risk for them. The Eco core is not part of the Rafale so far, sharing it might even get them the necessary funds to fully develop the ECO and produce parts via DRAL for French needs later.
At the same time hardly any critical tech share of the Rafale is known so far. So 1 billion offset investment into Kaveri, plays in favour for them, sadly there is no info on integrating it into Rafale so far either.

Further, says a top IAF source, a Kaveri engine based on Snecma's new core will leave the Tejas short of performance, providing barely 83-85 Kilonewtons (KN) of maximum thrust. In contrast, the GE and Eurojet engines already short-listed for selection provide 90-96 KN, a significant advantage. The source says sneaking in the underpowered Kaveri-Snecma engine through the GTRE back door will damage the LCA project.

For the IAF, the performance of the new engine is crucial. It has agreed to accept the Tejas into service as soon as the fighter obtains its Initial Operational Clearance (IOC) in December, even though the Tejas does not yet fly, climb, turn or accelerate fast enough. The IAF's accommodation is based on a promise from the ADA that a new, more powerful engine will overcome all the Tejas' current performance shortfalls.

Senior IAF officers explain that the DRDO needs the Tejas project to endorse the Kaveri-Snecma engine because Snecma insists on a minimum assured order of 300 engines as a precondition for partnering GTRE in "joint development". Since India's futuristic Medium Combat Aircraft -- the other potential user of a Kaveri-Snecma engine -- has not yet been sanctioned, only the Tejas programme, with some 120-140 fighters planned, provides the numbers needed for satisfying Snecma.

...In a move that will significantly affect two of India’s most ambitious aerospace endeavours, the Kaveri engine and Tejas Light Combat Aircraft (LCA) programmes are to be delinked from one another...

...The RFP is likely to be sent out to two global engine houses - the European consortium Eurojet Turbo for their EJ200 and General Electric for the GE F414.

French assistance

The delinking though is not the end of the road for the Kaveri. A committee headed by Air Vice Marshal M. Matheswaran, has been asked by Air Headquarters to scrutinise an offer made by the French engine house Snecma to co-develop and co-produce an engine along with the GTRE.

Snecma will have to convince the committee that they can indeed co-develop with the GTRE, an engine with a thrust of around 95 kilo kN. Crucial aspects like the transfer of technology to GTRE, number of engines to be produced and costs involved will be studied by the committee.

The delinking will mean that the Tejas will get a ready made engine in the immediate future, while an indigenous GTRE-Snecma developed Kaveri could fructify in five or six years.

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September 2008 - IAF not keen on French offer for Kaveri engine

...Constituted in September under the chairmanship of Air Vice Marshal M. Matheswaran, to look at the Snecma offer, the committee had as its members representatives from the designers of the Tejas — the Aeronautical Development Agency (ADA), the manufacturers of the Tejas — the Hindustan Aeronautics Limited (HAL), the Centre for Military Airworthiness and Certification, and IAF officers posted at ADA, the National Flight Test Centre and the Aircraft Systems and Testing Establishment.

Not in India’s interest

Highly placed sources told The Hindu that the committee felt that the Snecma offer was not in the IAF and India’s interest primarily because the French were offering a fully developed engine accepting which would “compromise and even kill the efforts, however meagre” that Indian defence laboratories had made towards developing the indigenous Kaveri engine.
The offer would also not help India get a co-designed, co-developed engine but rather an engine under a licence production arrangement, and at a great financial cost.

Explained a member of the committee: “It would be better if GTRE and other laboratories working on the Kaveri brought the engine to its logical conclusion even if it took a few more years. At least we would have mastery over the core technology. This will be better than importing the French core, paying a lifelong royalty, but saying the Kaveri is our indigenous effort. Neither the French nor anybody else will give us the know-how on the core technology.”

It's the least risk for them. The Eco core is not part of the Rafale so far, sharing it might even get them the necessary funds to fully develop the ECO and produce parts via DRAL for French needs later.
At the same time hardly any critical tech share of the Rafale is known so far. So 1 billion offset investment into Kaveri, plays in favour for them, sadly there is no info on integrating it into Rafale so far either.

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The ECO Core is part of the Rafale:

It was developed for the M88-9 (M88 able to deliver 9t of thrust but not inducted)

It was then used for the M88-4E to improve life of hot and rotating parts.

This is what I wanted and more than US, Britain or Russia, I will bet my money on French for being true to their word anyday. They may charge extra but have never let us down. I am more than willing to buy the post of @halloweene where he stated that M88 core has been tested with new materials to temperatures above 2200*F. This means we will have a very lean and mean engine in our stable as our very own.

This is what I wanted and more than US, Britain or Russia, I will bet my money on French for being true to their word anyday. They may charge extra but have never let us down. I am more than willing to buy the post of @halloweene where he stated that M88 core has been tested with new materials to temperatures above 2200*F. This means we will have a very lean and mean engine in our stable as our very own.

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DRDO cheif mentioned "new engine" in his quote so might be SAFRAN is also upgrading kaveri engine besides adding their core and this can be the reason that IAF is now not against this deal. So, we can expect thrust of 92Kn

DRDO cheif mentioned "new engine" in his quote so might be SAFRAN is also upgrading kaveri engine besides adding their core and this can be the reason that IAF is now not against this deal. So, we can expect thrust of 92Kn

if SAFRAN guys used this core in Kaveri, then what final thrust can we expect of Kaveri?

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The core of the M-88 is studied to allow a Family of Engine going from 7.5 t to 11 t. That is that all these engines will have the same core but not the same compressor and so on. So with this core you can specify what thrust you want and adapt the engine. If you put the M-88 core in the Kavari as it is it will certainly have the Thrust that was initially specified, but you can increase it with changes.

The core of the M-88 is studied to allow a Family of Engine going from 7.5 t to 11 t. That is that all these engines will have the same core but not the same compressor and so on. So with this core you can specify what thrust you want and adapt the engine. If you put the M-88 core in the Kavari as it is it will certainly have the Thrust that was initially specified, but you can increase it with changes.

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If you have a core proven for a certain thrust level, all you need is an efficient compressor and fan which can provide that kind of airflow.